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Message-Id: <20200722211223.1055107-1-jolsa@kernel.org>
Date: Wed, 22 Jul 2020 23:12:10 +0200
From: Jiri Olsa <jolsa@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andriin@...com>
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
Martin KaFai Lau <kafai@...com>,
David Miller <davem@...hat.com>,
John Fastabend <john.fastabend@...il.com>,
Wenbo Zhang <ethercflow@...il.com>,
KP Singh <kpsingh@...omium.org>,
Brendan Gregg <bgregg@...flix.com>,
Florent Revest <revest@...omium.org>,
Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH v8 bpf-next 00/13] bpf: Add d_path helper
hi,
adding d_path helper function that returns full path for
given 'struct path' object, which needs to be the kernel
BTF 'path' object. The path is returned in buffer provided
'buf' of size 'sz' and is zero terminated.
int bpf_d_path(struct path *path, char *buf, u32 sz);
The helper calls directly d_path function, so there's only
limited set of function it can be called from.
The patchset also adds support to add set of BTF IDs for
a helper to define functions that the helper is allowed
to be called from.
Also available at:
https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
bpf/d_path
v8 changes:
- rebased on Yonghong's latest changes
- factored btf_struct_access function [Andrii]
- fixed leftovers fro mthe preparation changes
thanks,
jirka
---
Jiri Olsa (13):
selftests/bpf: Fix resolve_btfids test
tools resolve_btfids: Add support for set symbols
bpf: Move btf_resolve_size into __btf_resolve_size
bpf: Add elem_id pointer as argument to __btf_resolve_size
bpf: Add type_id pointer as argument to __btf_resolve_size
bpf: Factor btf_struct_access function
bpf: Add btf_struct_ids_match function
bpf: Add BTF_SET_START/END macros
bpf: Add d_path helper
bpf: Update .BTF_ids section in btf.rst with sets info
selftests/bpf: Add verifier test for d_path helper
selftests/bpf: Add test for d_path helper
selftests/bpf: Add set test to resolve_btfids
Documentation/bpf/btf.rst | 25 +++++++++++++++
include/linux/bpf.h | 6 ++++
include/linux/btf.h | 3 +-
include/linux/btf_ids.h | 43 ++++++++++++++++++++++++-
include/uapi/linux/bpf.h | 13 ++++++++
kernel/bpf/bpf_struct_ops.c | 6 ++--
kernel/bpf/btf.c | 148 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------
kernel/bpf/verifier.c | 23 ++++++++++----
kernel/trace/bpf_trace.c | 48 ++++++++++++++++++++++++++++
scripts/bpf_helpers_doc.py | 2 ++
tools/bpf/resolve_btfids/main.c | 15 ++++++++-
tools/include/linux/btf_ids.h | 43 ++++++++++++++++++++++++-
tools/include/uapi/linux/bpf.h | 13 ++++++++
tools/testing/selftests/bpf/prog_tests/d_path.c | 162 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/prog_tests/resolve_btfids.c | 34 ++++++++++++++++++++
tools/testing/selftests/bpf/progs/test_d_path.c | 64 ++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/test_verifier.c | 19 +++++++++++-
tools/testing/selftests/bpf/verifier/d_path.c | 37 ++++++++++++++++++++++
18 files changed, 667 insertions(+), 37 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/d_path.c
create mode 100644 tools/testing/selftests/bpf/progs/test_d_path.c
create mode 100644 tools/testing/selftests/bpf/verifier/d_path.c
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